I just installed the latest NVidia driver for Quadro 4000 cards.From this moment any of my shaders linking fails with shader link error.
It is worth noting I am using OpenGL 4.2 with separate shader objects.My OS is Windows7 64bit .
Before the update I had 309 version of the driver.
Now I reverted to the version 295.x and it works again.
Anyone knows something about it.Can it be driver bug?How is it submitted to NVidia dudes?

it might be a bug in the driver but it also might be a bug in your shaders, e.g. they are not conform to the specs but the old drivers didn't catch your bug. Without looking at the shaders and the drivers error message we can't tell where the problem is.